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Full text of "Text Book Of Mechanical Engineering"

476

Natures Stores of Energy.

EXAMPLES OF ENERGY FORMS (continued,}.

I 7. Muscular Energy :

8.  Gas Expansion :

9.  Mechanical Energy:

10.  Electrical Energy :

11.  Heat Energy :

12.  Chemical Energy :

\i3. Radiant Energy:

(When in motion.)

e.g., the wind, heat engines.

As in machines.

{The current in motion, as in
Voltaic and Faradaic elec-
tricity.

Being molecular motion,
f When combining, on account
\    of affinity of elements.
/The  vibration of the  ether
(    causing light and heat.

The true energy is that only which is available, by reason of a
certain difference of* pressure/ 'head/ or ' potential/ as measured
within fullest attainable limits.

NATURE'S STORES OF ENERGY.

I. Heat Energy:
II. Water Energy :

III.  Wind Energy:

IV.  Coal Energy:

V. Petroleum  or   oil

Energy :
VI. Tidal Energy :

VII. Electrical Energy:
VIII. Food Energy:

f Direct from sun : probably sustained
1    by meteoric impact.

Due to fall from mountains to sea.

/Due to difference of pressure caused
\   by sun's heat.

(Due to chemical condition of separ-
\    ation.

[Ditto.

Due to moon's attraction, principally.

'(i.) Due to separation of kind, as in thunder
clouds, and untractable : (2.) Due to very
small difference's of potential in both air
and earth, and valueless for large oper-
ations.

(Due to sun's  action  o-n growth  of
(    plants.

All these, excepting VI, are due to the sun's heat, which has
grown coal forests and daily evaporates water. V. is probably
iue to a condensation of the once glowing earth.